#top {
  width: 400px;
  height: 200px;
  border: solid 1px;
}

#cent {
  width: 400px;
  height: 100px;
  border: solid 1px;
}

#bottom {
  position: relative;
  width: 400px;
  height: 200px;
  border: solid 1px;
  display: none;
}
button {
  position: absolute;
  right: 0;
  bottom: 0;
}

h3 {
  text-align: center;
}

span {
  display: block;
  height: 60px;
}

#cent {
  position: relative;
}

#cent>span{
  height: 13px;
  font-size: 12px;
}
a {
  position: absolute;
  right: 0;
  bottom: 0;
}
